The placenta is the region where,.......

Amniotic fluid is found in

In the mammalian embryo,the excretory material is stored in:

The longest gestation period among the given options is found in

After one month of pregnancy,the embryo's $A$ is formed. By the end of the $B$ month of pregnancy,the foetus develops limbs and digits. By the end of $C$,most of the major organ systems are formed,for example,the limbs and external genital organs are well-developed. By the end of $D$,the body is covered with fine hair,eyelids separate,and eyelashes are formed. Here $A$ and $D$ refer to:

Select the correct option regarding the function of gonadotropins in a pregnant woman.